7RNG image
Entry Detail
PDB ID:
7RNG
Keywords:
Title:
Crystal structure of caspase-3 with inhibitor Ac-ITAKD-CHO
Biological Source:
PDB Version:
Deposition Date:
2021-07-29
Release Date:
2022-06-01
Method Details:
Experimental Method:
Resolution:
2.55 Å
R-Value Free:
0.24
R-Value Work:
0.17
R-Value Observed:
0.18
Space Group:
P 63
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Caspase-3 subunit p17
Chain IDs:A, C
Chain Length:141
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Caspase-3 subunit p12
Chain IDs:B, D
Chain Length:95
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Ac-ITAKD-CHO
Chain IDs:E (auth: F), F (auth: G)
Chain Length:6
Number of Molecules:2
Biological Source:synthetic construct
Primary Citation
Characterization of caspase-2 inhibitors based on specific sites of caspase-2-mediated proteolysis.
Arch Pharm 355 e2200095 e2200095 (2022)
PMID: 35642311 DOI: 10.1002/ardp.202200095

Abstact

Since the discovery of the caspase-2 (Casp2)-mediated ∆tau314 cleavage product and its associated impact on tauopathies such as Alzheimer's disease, the design of selective Casp2 inhibitors has become a focus in medicinal chemistry research. In the search for new lead structures with respect to Casp2 selectivity and drug-likeness, we have taken an approach by looking more closely at the specific sites of Casp2-mediated proteolysis. Using seven selected protein cleavage sequences, we synthesized a peptide series of 53 novel molecules and studied them using in vitro pharmacology, molecular modeling, and crystallography. Regarding Casp2 selectivity, AcITV(Dab)D-CHO (23) and AcITV(Dap)D-CHO (26) demonstrated the best selectivity (1-6-fold), although these trends were only moderate. However, some analogous tetrapeptides, most notably AcDKVD-CHO (45), showed significantly increased Casp3 selectivities (>100-fold). Tetra- and tripeptides display decreased or no Casp2 affinity, supporting the assumption that a motif of five amino acids is required for efficient Casp2 inhibition. Overall, the results provide a reasonable basis for the development of both selective Casp2 and Casp3 inhibitors.

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